Adjustable fps?

[CDN_Stalker]

Originally Posted by Goge

The simplest solution is the best. Adjustable spring length? Anyway, if you want to buy it, here is the review

Madbull Crawler Barrel

That only works if one has an AEG that is easy to replace the inner barrel in. I have two TM MP5s, one literally has to disassemble the entire gun to be able to get the inner barrel swapped out. A sliding sealed sleeve would work great for decreasing fps, but the issue still exists of idiots increasing the velocity after chronying.